In the left part of the window, in the Anti-Virus protection section, select the File Anti-Virus subsection.
In the right part of the window, the settings of the File Anti-Virus component are displayed.
In the Security level section, click the Settings button.
The File Anti-Virus window opens.
In the File Anti-Virus window, select the Performance tab.
In the Scan methods section:
If you want File Anti-Virus to use heuristic analysis, select the Heuristic Analysis check box and use the slider to set the heuristic analysis level: Light scan, Medium scan, or Deep scan.
If you do not want File Anti-Virus to use heuristic analysis, clear the Heuristic Analysis check box.